Boom point sheave assembly



Dec. 15, 1931. L. A. RUSSELL 1,336,281

BOOM POINT SHEAVE ASSEMBLY Filed March 24, 1930 2 Sheets-Sheet 1 gwuantoc 1J7. Russell.

Dec. 15, 1931. A. RUSSELL BOOM POINT SHEAVE ASSEMBLY Filed March 24, 1950 2 Sheets-Sheet 2 [5 cranes have been designed so that theymay Patented Dec. 15, 1931 i m STATES OFFICE? marine A. mussnmaor MILWAUKEE, WISCONSIN, nssmuon 'ro KOEHRING county,

- 01 MILWAUKEE, w'lscou-sm, A zCQkPORATION A n some .BOIHT semvmssemi 1 Application filed Mar uee, 19.30. semi No. 438,522.;

The present invention deals with the art of cranes 'known as the convertible type. T ese machines-are ca led slually clamshe' l i or dragline cranes, and inrecent years such bealtered in slight particulars whereby the ma n, crane lmae inemay be used o pe te a clamjshell' boom and bucket e a dragl-i e b om, and bucket; Usually the same boom is employed but the buckets are changed and the cables are difierently reeved and operated. When a clamshell bucjketis used on the boom of such a machine as described, t ere v are employed at the upper endor b m po n a series ofsheaves, about six in number, over which the cable reeves for the cables that hoist the boom andwhic'hhandle the 'bucket' pass. When the machine is converted into adrag'line machine, four of the Sheavesnsed for clamshe'llwork are utilized, when only a single sheave is needed to carry the hoisting line of the bucketand this sheaveshould yoke means that enables me to employ the six; sheave arrangement-. iorflclamshll work in) which two middle sheaves receive the hoisting and eros'sing'l'inesffortheclamshell bu ketasaidstrueture'being adapted toib'e changed toremove the'saidtwo middle sheaYeS and permit i the substitution of a iairlead-sheave for dragline work. This general idea of .conw struction the essential feature of thie invention, but inl-addition thereto 'Ike'mploy a special design of .fairlead sheave [in which the axis of thesheave is abouti'onltheline with certain swivel mountingsfof the supp rting. 5 devicef r-su'ch sheave, whereby in the dragline wo a d he use o the'hoisting c bley he load about the p votalaxis of the fairlea sheave tends to counterbalance the cable boom on the load pivot axis- With "the f )r egoing general features of constructlon 1n mind, therefore, reference in which ma fibe had to the" accoinpan 3 ring drawings,

Figure '1 is a plan view of a preferred icon n struction of my device illustrating the fair-e lead sheave mounted in place'for use.

Figure 2 is a vertical sectional view on "Figure 5 is a plan view showing the convertible device of my invention, "with the fairlead sheaveland mounting removed and the clamshell hoist and closing line sheaves.

substituted therefor.

Referring now to the drawings, there is provided at the upper end of the boom used for clamshell and dragline crane work, the

boonr point yoke 1 having the spaced .oke

sides or members 2 and 3. Oifstanding mm the body of the yoke 1 between the sides 12 and 3 are the attaching lugs 4 and 5which may be secured by suitable fastenings of any kind to the boom'structure.

The fairlead pulley or sheave 6 is disposed in a fairlead housing designated 7 and carried by a shaft 8 mounted in bearings 32 at opposite sides of said housings The housing? is provided with a removably mounted guardli) adapted to extend-over a portion of theupperi part- 0f the pulley or sheave Sand at i Ch d; to the housin '7'by cap screws 35%, 35, 36,"fli dfl 37; or the "li e. The fairjlead shea e ii is fiankedjon bothsides by depending portions 26 'and27 of thehousing the'latterhaving V a sort of guard functionbut spaced to permit the cable reeves to work therebetween.

I The guard 9 is moreover lined byithe provision of the openings38 andj39 and similarl the side or flanking portions .are' formed wit openings 40 and 41. V

' Outboard sheaves 10 and 11 are mounted on the yoke 1 at opposite 'sidesofthe boom', be

ing carriedby short shafts l4 and The said short shafts may be held in placeby any suitable means such as cross pins and the like and are readily removable for purposesto be hereinafter referredto. A. bearing 12% er trunnion or journal member 17 of the fairlead housing 7 and this bearing is removably mounted on the boom A. Carried by the boom A are fixed bracket members 18, 19, 20, and 21, the members 18 and 19 being provided with aligned bores andthe members 20 and 21 being similarly provided with aligned bores. The lateral portions of the bearing member designated 28, 29. 30, and 31 are provided with bores in alignment with the bores in the bracket members. Suitable pins 22 and 33 are provided with holes 23-23 adjacent to their ends and these pins 22 and 33 are mounted in the aligned bores of the complemental bracket members 1819, and 202l and pass through the said aligned bores in the bearing member 13 to removably mount this bearing member in position. Each pin aforesaid may be secured in place by cotter pins or other similar means 24.

The fairlead guard is provided with a suitable cable clearance 25 and the boom attaching lugs 4 and 5 are reinforced by ribs 42 and 44 and also with reinforcing bosses 43 and 45.

It will be noted that by simply removing the pins 22 and 33 the bearing member 13 may be readily displaced laterally to release the fairlead housing 7 under which conditions said housing and the fairlead sheave 6 attached thereto may be readily removed bodil Of course when the fairlead sheave 6 and its mounting parts are employed, the crane, the boom of which is equipped with such structure, is designed for dragline work, the

hoisting cable of the dragline bucket pass ing over and down from the sheave 6 in aself-evident manner. When, however, the

shaft substituted therefor and designated 50 in Figure 5 of the drawings. This long shaft 50 is adapted to support two middle sheaves 51 and 52 which will guide and support the cable reeves of the clamshell bucket, which reeves are commonly known as the hoisting line and the closing line to those versed in this art.

Thus by the simple expedient of provid ing the special detachable mounting for the boom point fairlead sheave of a dragline crane, as set forth herein, the sheave yoke at the point of the boom may be converted into the sheave yoke of a clamshell crane and support the necessary six sheaves for clamshell bucket work in a self-evident manner.

In this operation of conversion, it is only necessary to remove, or replace, as the case may be, the parts supporting the lower bearing of the fairlead sheave housing, and said housing along with its sheave contained thereon.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is-

- 1.,A boom point sheave Imounting for dragline, clamshell, and like cranes, co1nprising, in combination a boom structure, a sheave supporting yoke mounted thereon, outboard sheaves carried by said boom struc ture and yoke," and a detachable sheave mounting intermediate said outboard sheaves removable for the substitution of other sheave means, whereby the sheave mounting may be converted into one suitable for clamshell work or for dragline work.

2. A boom point sheave mounting for dragline, clamshell, and like cranes, comprisi g, in combination, a boom structure, a sheave supporting yoke mounted thereon, outboard sheaves carried by said boom struc ture and yoke, a detachable sheave mounting lntermediate said outboard sheaves removable for the substitution of other sheave means, whereby the sheave mounting may be converted into one suitable for clamshell work or for dragline work, and a fairlead sheave carried by the sheave mounting above mentioned.

3. A boom point sheave mounting for dragline, clamshell, and like cranes, comprising, in combination, a boom structure, a sheave supporting yoke mounted thereon, outboard sheaves carried by said boom structure and yoke, a detachable sheave mounting intermediate said outboard sheaves removable for the substitution of other sheave means, whereby the sheave mounting may be converted into one suitable for clamshell work or for dragline work, and bearing means carried by the boom and said yoke and disposed in longitudinal alignment lengthwise of the boom to support said sheave mounting in a swivelled manner.

4. In a boom point sheave mounting for cranes, in combination, a boom point yoke, a boom point to which said yoke is attached, outboard sheaves supported at opposite sides'of the boom point by said yoke and boom point itself, inboard sheave means arranged between the outboard sheaves and between the sides of the boom point, and bearings disposed lengthwise of the boom point above and below the plane in which the said sheaves are arranged, one of said bearings being detachable to facilitate the removal and replacement of a boom point fairlead sheave mounting intermediate the outboard sheaves.

5. In a boom point sheave mounting for cranes, in combination, a boom point struc- 'means for said inboard sheave comprising bearings in alignmentand longitudinally of the boom on 'a line substantially intersecting the axis of the inboard sheave.

6. In a boom point sheave mounting for cranes, in combination, a boom point structure, a yoke carried thereby, outboard sheaves supported by the yoke and the boom point structure, an inboard sheave disposed between the outboard sheaves, and mounting means for said inboard sheave comprising bearings in alignment and longitudinally of the boom on a line substantially intersecting the axis of the inboard sheave, said sheave mounting comprising a guard provided with an axis to support the lnboard sheave, and said guard being equipped with journal members at its upper and lower ends arranged in the bearings aforesaid.

7. In a boom point sheave mounting of the class described, in combination, a boom point yoke, a boom point structure to which the yoke is attached, outboard sheaves at opposite sides of the boom point structure and supported by it and the sides of the yoke, short shafts carried by the yoke and boom point structure, one for each outboard sheave, said shafts being in alignment and displaceable so as to permit the substitution therefor of a long shaft occupying the bearings of the short shafts and extending across the boom point structure, a swivel fairlead sheave disposed between the outboard sheaves and bet-ween the sides of the boom point structure, a mounting means for the swivel fair-lead sheave comprising a housing having upper and lower journal members, and bearings on the yoke and on the boom point structure above and below the swivel fairlead sheave respectively and arranged to support the journal members of said housing, one of said bearings being detachable so as to facilitatethe removal of the swivel fairlead sheave and the substitution for the same of one or more sheaves for clamshell work to be carried by a shaft substituted for the small shafts above mentioned. Y o v "8, In a boom point sheave structure, in

combination, a boom point, apart carried 9. In a boom point fairlead and sheave assembly, a yoke attachable to the point of a boom, outboard cable sheaves spaced apart and mounted on the yoke, a fairlead mountlng having its axis longitudinal of the boom, and a fairlead sheave carried by said axis mounting.

10.-In a boom point fairlead and sheave assembly, a yoke attachable to the point of boom, outboard cable sheaves spaced apart and mounted on the yoke, a fairlead mounting having its axis longitudinal of the boom, and a fairlead sheave carried by. said mounting, said fairlead mounting and sheave being removable so that a shaft may be mounted transversely of the yoke to carry the said outboard cable sheaves and other sheaves which will occupy the space between the outboard cable sheaves.

In testimony whereof I aflix my signature.

LESLIE A. RUSSELL.

' izs 

